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Paper Abstract and Keywords
Presentation 2012-08-31 11:05
Performance of Iterative Decision-Directed Chanel Estimation Using LDPC Code for DFT-Precoded OFDMA
Yoshikazu Tanaka (Tokyo City Univ), Nobuhiko Miki, Teruo Kawamura (NTT DOCOMO), Mamoru Sawahashi (Tokyo City Univ) RCS2012-116
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents the average block error rate (BLER) performance of iterative decision-directed channel estimation (DDCE) using the Low-Density Parity-Check (LDPC) code for discrete Fourier transform (DFT)-precoded Orthogonal Frequency Division Multiple Access (OFDMA). We apply iterative DDCE using soft-decision symbol estimation based on the log-likelihood ratio (LLR) of an extrinsic probability at the layered belief propagation (BP) decoder output in addition to reference signals (RSs). The improved channel response is used to generate a linear minimum mean-square error (LMMSE) based weight in the frequency domain equalizer (FDE) and to compute the LLR of a posteriori probability at the FDE output. Computer simulation results show that the iterative DDCE with the number of iterations of 2 for the coding rate of R = 1/3 and 1/2 can decrease the required average received signal-to-noise power ratio (SNR) satisfying the average BLER of 10-2 by approximately 0.7 and 0.4 dB compared to that for RS based channel estimation. Consequently, the loss in the required average received SNR compared to the ideal channel estimation is suppressed to within 0.4 dB in the 9-path Extended Typical Urban channel model.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communications / single-carrier FDMA / LDPC code / channel estimation / DFT-precoded OFDMA / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 192, RCS2012-116, pp. 121-126, Aug. 2012.
Paper # RCS2012-116 
Date of Issue 2012-08-23 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2012-116

Conference Information
Committee SAT RCS  
Conference Date 2012-08-30 - 2012-08-31 
Place (in Japanese) (See Japanese page) 
Place (in English) Kochi City Cultura-Plaza CUL-PORT 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Satellite Communications, Broadcasting, Error Correction, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2012-08-SAT-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance of Iterative Decision-Directed Chanel Estimation Using LDPC Code for DFT-Precoded OFDMA 
Sub Title (in English)  
Keyword(1) Mobile communications  
Keyword(2) single-carrier FDMA  
Keyword(3) LDPC code  
Keyword(4) channel estimation  
Keyword(5) DFT-precoded OFDMA  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yoshikazu Tanaka  
1st Author's Affiliation Tokyo City University (Tokyo City Univ)
2nd Author's Name Nobuhiko Miki  
2nd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
3rd Author's Name Teruo Kawamura  
3rd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
4th Author's Name Mamoru Sawahashi  
4th Author's Affiliation Tokyo City University (Tokyo City Univ)
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Speaker Author-1 
Date Time 2012-08-31 11:05:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2012-116 
Volume (vol) vol.112 
Number (no) no.192 
Page pp.121-126 
#Pages 6 
Date of Issue 2012-08-23 (RCS) 

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